ad0809.asm

ADC0809并行AD转换器设计的的数字电压表程序

CH		EQU 30H 
DPCNT	EQU 31H 
DPBUF	EQU 33H 

GDATA	EQU 32H 
ST		BIT P3.0 
OE		BIT P3.1 
EOC		BIT P3.2 
  
		ORG 00H 
		LJMP START 
		ORG 0BH 
		LJMP T0X 
		ORG 30H 

START:	MOV CH,#0BCH  

        MOV P3,CH   //通道3	    

		MOV DPCNT,#00H 
		MOV R1,#DPCNT 
		MOV R7,#5 
		MOV A,#10 
		MOV R0,#DPBUF 
LOP:	MOV @R0,A 
		INC R0 
		DJNZ R7,LOP 
		MOV @R0,#00H 
		INC R0 
		MOV @R0,#00H 
		INC R0 
		MOV @R0,#00H //开始个位无显示
		MOV TMOD,#01H 
		MOV TH0,#(65536-4000)/256 
		MOV TL0,#(65536-4000) MOD 256 
		SETB TR0 
		SETB ET0 
		SETB EA 
WT:		CLR ST 
		SETB ST 
		CLR ST 
WAIT:	JNB EOC,WAIT 
		SETB OE 
		MOV GDATA,P0 
		CLR OE 
			mov dptr,#tab	  	;将AD转换结果转换成BCD码
	mov a,GDATA 
	movc a,@a+dptr
	mov b,#2
	div ab
	mov r1,b
	mov b,#10
	div ab
	mov 38H,a
	mov 39H,b
	cjne r1,#01,kk1
        mov 3AH,#05
back:   SJMP WT 
kk1:    mov 3AH,#00
        ajmp back	

	
T0X:	NOP 
		MOV TH0,#(65536-350)/256 
		MOV TL0,#(65536-350) MOD 256 

		MOV A,#0FFH
		MOV P2,A		  //清屏

		MOV A,DPCNT 
		CJNE A,#5,NEX
		MOV DPTR,#DPCD 
		MOV A,DPCNT 
		ADD A,#DPBUF 
		MOV R0,A 
		MOV A,@R0 
		MOVC A,@A+DPTR 
		ORL A,#080H
		MOV P1,A 
		SJMP NEX1
		
NEX:    MOV DPTR,#DPCD 
		MOV A,DPCNT 
		ADD A,#DPBUF 
		MOV R0,A 
		MOV A,@R0 
		MOVC A,@A+DPTR 
		MOV P1,A 

NEX1:   MOV DPTR,#DPBT 
		MOV A,DPCNT 
		MOVC A,@A+DPTR 
		MOV P2,A 
		INC DPCNT 
		MOV A,DPCNT 
		CJNE A,#8,NEXT 
		MOV DPCNT,#00H 
NEXT:	RETI 
DPCD:	DB 3FH,06H,5BH,4FH,66H 
		DB 6DH,7DH,07H,7FH,6FH,00H 
DPBT:	DB 0FEH,0FDH,0FBH,0F7H 
		DB 0EFH,0DFH,0BFH,07FH
tab:
db  0,	0,  0,	1,	0,	2,	0,	0,	3,	0
db	4,	0,	0,	5,	0,	6,	0,	0,	7,	0
db	8,	0,	0,	9,	0,	0,	10,	0,	11,	0
db	0,	12,	0,	13,	0,	0,	14,	0,	15,	0
db	0,	16,	0,	17,	0,	0,	18,	0,	19,	0
db	0,	20,	0,	0,	21,	0,	22,	0,	0,	23
db	0,	24,	0,	0,	25,	0,	26,	0,	0,	27
db	0,	28,	0,	0,	29,	0,	0,	30,	0,	31
db	0,	0,	32,	0,	33,	0,	0,	34,	0,	35
db	0,	0,	36,	0,	37,	0,	0,	38,	0,	39
db	0,	0,	40,	0,	0,	41,	0,	42,	0,	0
db	43,	0,	44,	0,	0,	45,	0,	46,	0,	0
db	47,	0,	48,	0,	0,	49,	0,	50,	0,	0
db	51,	0,	0,	52,	0,	53,	0,	0,	54,	0
db	55,	0,	0,	56,	0,	57,	0,	0,	58,	0
db	59,	0,	0,	60,	0,	0,	61,	0,	62,	0
db	0,	63,	0,	64,	0,	0,	65,	0,	66,	0
db	0,	67,	0,	68,	0,	0,	69,	0,	70,	0
db	0,	71,	0,	0,	72,	0,	73,	0,	0,	74
db	0,	75,	0,	0,	76,	0,	77,	0,	0,	78
db	0,	79,	0,	0,	80,	0,	0,	81,	0,	82
db	0,	0,	83,	0,	84,	0,	0,	85,	0,	86
db	0,	0,	87,	0,	88,	0,	0,	89,	0,	90
db	0,	0,	91,	0,	0,	92,	0,	93,	0,	0
db	94,	0,	95,	0,	0,	96,	0,	97,	0,	0
db	98,	0,	99,	0,	0,	100,	0,	0,	0
		END